Portable power supply



FIG. 1 is a perspective view of a portable power supply showing mypresent design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view.

The ornamental design for a portable power supply, as shown anddescribed.